Screenshot tests (#130)

* #9 Add snapshot testing library

* #9 Create script to boot test simulators

* #9 Create the UI test plan

* #9 Create shared schemes for test targets

* #9 Disable split view for UI tests

* #9 Fix fastlane dependencies

* #9 Add snapshot testing to the application

* #9 assert screenshots

* #9 fix swipe gestures on iPad

* #9 Fix accessing items in session verification screen

* #9 Workaround for flaky unit test

* #9 Specify scheme for alpha build

* #9 Add reference screenshots

* Update python script path and check assets for png check

* Update script path

* Use static timezone for simulator time

* Fix build after SwiftFormat

* Add changelog

* Upload failed screenshots artifact

* Always upload artifacts

* Update boot simulator script

* Update simulator overridden time

* Install pytz before tests

* Get time from Ruby script

* Disable SwiftUI animation when running UI tests

* Update screenshots after animation setting

* Include reference images in the artifact

* Update matching precision

* Update image matching precision & revert artifact content

* Include Xcode result in the artifact

* Update test output directory

* Disable gradient on splash screen for tests

* Tap next button explicitly

* Wait a bit before checking alert

* Wait 1 second

* Run SwiftFormat on project

* Ignore temporary screenshots

* Fix most of the PR remarks

* Fix conflicts

* Bump Python version to 3

* Update reference screenshots for authentication screens

* Update SwiftFormat

* Fix flakey session verification test.

* Update scheme.

Co-authored-by: Doug <douglase@element.io>

Tools/Scripts/Templates/SimpleScreenExample/ElementX/View/TemplateScreen.swift

@@ -43,7 +43,7 @@ struct TemplateScreen: View {
                 .padding(.horizontal)
                 .padding(.vertical)
                 .readableFrame()
-                .background(.regularMaterial)
+                .background(Color.element.system)
         }
     }
     

Tools/Scripts/Templates/SimpleScreenExample/Tests/UI/TemplateScreenUITests.swift

@@ -26,6 +26,8 @@ class TemplateScreenUITests: XCTestCase {
         XCTAssert(title.exists)
         
         XCTAssertEqual(title.label, "Make this chat public?")
+
+        app.assertScreenshot(.simpleRegular)
     }
     
     func testUpgradeScreen() {
@@ -36,5 +38,7 @@ class TemplateScreenUITests: XCTestCase {
         XCTAssert(title.exists)
         
         XCTAssertEqual(title.label, "Privacy warning")
+
+        app.assertScreenshot(.simpleUpgrade)
     }
 }